Gawayne has a conflict with himself because he has married a lady whom he does not love, and he fears lifelong unhappiness.
Explanation:
What Gawayne is going through is an internal conflict, which means that he is struggling with something within himself. The cause of his struggle is that he has married a lady whom he does not love, and he fears lifelong unhappiness.
The rest of the options are incorrect, because:
Gawayne isn't angry. He is sad about what's happened (<em>he sat down and looked </em><em>sadly</em><em> into the glowing embers and spoke no word</em>).
Another lady isn't mentioned. He simply doesn't love the woman he married.
He knows that the lady has invoked blessings (<em>He thought of his uncle's favour, of the poor lady's gratitude, </em><em>of the blessing she had invoked upon him</em>...)